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There are several types of snapshots:

• disk snapshot (aka external snapshot)
• VM state snapshot
• system checkpoint

Disk snapshot saves the content of the disks at a desiginated point of time;
VM state snapshot tracks only the state of RAM and all other resources in use by the VM;
system System checkpoint captures both the disk and the VM state.

The current KVM takes a long time to take a disk snapshot, where the VM can be unresponsive for several minutes. We would like to investigate and find out if the new KVM support the disk-only snapshot option.

There are 2 tasks :
#Investigate the disk only snapshot feature: does it work for current KVM on 4.1

1. IF the disk-only snapshot is supported, then we need to use the libvert API
   to add the disk snapshot support.